Fruit consumption and processing result in considerable volumes of residual biomass. Transformation of this biomass into biosorbents offers an alternative for its reuse and disposal. As the green coconut shell is a waste often discarded in landfills and dumps, generating gases and leachate, two biosorbents were developed from the epicarp and mesocarp of green coconut to adsorb fluoride ions in aqueous solution. The kinetic experiments showed that sorption of fluoride ions reached equilibrium at 300 min for both epicarp and mesocarp at temperatures of 25°C, 35°C, and 45°C. The removal efficiency of fluoride ions varied from 66.25% (at 25°C) to 77.50% (at 45°C) for the epicarp and from 90% (at 25°C) to 97.50% (at 45°C) for the mesocarp. The thermodynamic parameters of the adsorption process showed that adsorption is a spontaneous, endothermic process for both biosorbents. The adsorption was classified as chemical, with the Langmuir isotherm model best suited to the adsorption isotherms data.

中文翻译：

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绿色椰子的果皮和中果皮用于去除水溶液中氟离子的评估

水果的消耗和加工导致大量残留生物量。将该生物质转化为生物吸附剂为其再利用和处置提供了另一种选择。由于绿色椰子壳是一种经常在垃圾填埋场和垃圾场中丢弃的废物，会产生气体和渗滤液，因此从绿色椰子的果皮和中果皮开发了两种生物吸附剂，以吸附水溶液中的氟离子。动力学实验表明，在25°C，35°C和45°C的温度下，果皮和中果皮的氟离子吸附在300分钟时达到平衡。对于果皮，氟离子的去除效率从66.25％（在25°C下）到77.50％（在45°C下）和对于中果皮从90％（在25°C上）到97.50％（在45°C）之间变化。吸附过程的热力学参数表明，吸附是自发的，两种生物吸附剂的吸热过程。吸附被归类为化学吸附，Langmuir等温线模型最适合吸附等温线数据。